doc: nrf54l: flpr: move nRF54L15 FLPR support to production

nRF54L15 FLPR kernel support is now considered production
ready.

Signed-off-by: Marcin Szymczyk <[email protected]>

Author: masz-nordic

doc/nrf/app_dev/device_guides/nrf54l/vpr_flpr.rst

@@ -25,7 +25,7 @@ The following section provides a support overview for various FLPR targets:
      - Supported drivers
    * - nRF54L15 FLPR running from SRAM
      - ``nrf54l15dk/nrf54l15/cpuflpr``
-     - Experimental
+     - Supported
      - * GPIO
        * GPIOTE
        * GRTC
@@ -34,7 +34,7 @@ The following section provides a support overview for various FLPR targets:
        * VPR
    * - nRF54L15 FLPR running from RRAM
      - ``nrf54l15dk/nrf54l15/cpuflpr/xip``
-     - Experimental
+     - Supported
      - --
    * - nRF54L05 FLPR running from SRAM
      - Not available