[nrf fromtree] platform: nrf54l: remove forced uart settings

UART should not be force set for 54l devices.
This to support user selecting which UARTs are secure.

Change-Id: Ic4fffe748476b85e2e6758d92d687ec36b179e3e
Signed-off-by: Dag Erik Gjørvad <[email protected]>

Author: degjorva

platform/ext/target/nordic_nrf/common/nrf54l/config.cmake

@@ -8,7 +8,7 @@
 
 include(${PLATFORM_PATH}/common/core/config.cmake)
 
-set(SECURE_UART20                       ON         CACHE BOOL      "Enable secure UART" FORCE)
+set(SECURE_UART20                       ON         CACHE BOOL      "Enable secure UART")
 set(BL2                                 OFF        CACHE BOOL      "Whether to build BL2" FORCE)
 set(NRF_NS_SECONDARY                    OFF        CACHE BOOL      "Enable non-secure secondary partition" FORCE)
-set(NRF_SECURE_UART_INSTANCE            20         CACHE STRING    "The UART instance number to use for secure UART" FORCE)
+set(NRF_SECURE_UART_INSTANCE            20         CACHE STRING    "The UART instance number to use for secure UART")