Add nRF54L15 support

[HaoboGu]

Now basic keyboard works, but nRF54 lacks storage support, waiting for upstream.

[github-actions]

Binary Size Report

use_config/nrf52832_ble

   text	   data	    bss	    dec	    hex	filename
 318604	   5072	  31692	 355368	  56c28	rmk-nrf52832

Diff

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.0%      +2  [ = ]       0    .strtab
  -1.9%      -1  [ = ]       0    [Unmapped]
  -0.0%      -9  [ = ]       0    .debug_str
  -0.0%      -8  [ = ]       0    TOTAL

use_config/nrf52840_ble

   text	   data	    bss	    dec	    hex	filename
 355984	   5072	  44772	 405828	  63144	rmk-nrf52840

Diff

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.0%    +277  [ = ]       0    .debug_loc
  +0.1%    +225  [ = ]       0    .strtab
  +0.0%    +213  [ = ]       0    .debug_str
  +0.1%    +144  [ = ]       0    .debug_ranges
  +0.0%    +119  [ = ]       0    .debug_line
  +0.0%     +48  [ = ]       0    .symtab
  +0.0%     +16  [ = ]       0    .debug_aranges
  +0.0%     +16  [ = ]       0    .debug_frame
  +0.1%      +1  [ = ]       0    .defmt
  -2.0%      -1  [ = ]       0    [Unmapped]
  -0.0%     -10  [ = ]       0    .debug_info
  -0.0%     -32  -0.0%     -32    .text
  +0.0%   +1016  -0.0%     -32    TOTAL

use_config/pi_pico_w_ble

   text	   data	    bss	    dec	    hex	filename
 590844	      0	  53124	 643968	  9d380	rmk-pi-pico-w

Diff

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.0%      +6  [ = ]       0    .strtab
  +0.0%      +5  [ = ]       0    .debug_str
  -0.0%      -3  [ = ]       0    .debug_line
  +0.0%      +8  [ = ]       0    TOTAL

use_config/rp2040

   text	   data	    bss	    dec	    hex	filename
 135548	      0	  14652	 150200	  24ab8	rmk-rp2040

Diff

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  -0.0%      -2  [ = ]       0    .strtab
  -3.9%      -2  [ = ]       0    [Unmapped]
  -0.0%      -4  [ = ]       0    TOTAL

use_config/stm32f1

   text	   data	    bss	    dec	    hex	filename
  51012	     24	   6848	  57884	   e21c	rmk-stm32f1

Diff

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  [ = ]       0  [ = ]       0    TOTAL

use_config/stm32f4

   text	   data	    bss	    dec	    hex	filename
 141440	    320	  15984	 157744	  26830	rmk-stm32f4

Diff

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  -0.0%      -4  [ = ]       0    .debug_str
  -0.0%      -4  [ = ]       0    TOTAL

use_config/stm32h7

   text	   data	    bss	    dec	    hex	filename
 127196	    264	  15200	 142660	  22d44	rmk-stm32h7

Diff

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.0%      +5  [ = ]       0    .debug_str
  -2.2%      -1  [ = ]       0    [Unmapped]
  +0.0%      +4  [ = ]       0    TOTAL

[cloudflare-workers-and-pages]

Deploying rmk-rs with    Cloudflare Pages

Latest commit:	c7e383d
Status:	✅  Deploy successful!
Preview URL:	https://f0399b57.rmk-4a2.pages.dev
Branch Preview URL:	https://feat-nrf54l15.rmk-4a2.pages.dev

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