cmake: arm: linker: remove usage of ld-specific ADDR() function

Remove usage of ld-specific ADDR function within the cmake linker
generator scripting. Since the linker generator scripting doesn't
support MPUs, we can simply set the __ramfunc_region_start symbol to be
equal to __ramfunc_start

Fixes #87200

Signed-off-by: Daniel DeGrasse <[email protected]>
(cherry picked from commit b84076a)

Author: danieldegrasse

cmake/linker_script/arm/linker.cmake

@@ -144,7 +144,7 @@ endif()
 
 include(${COMMON_ZEPHYR_LINKER_DIR}/ram-end.cmake)
 
-zephyr_linker_symbol(SYMBOL __ramfunc_region_start EXPR "ADDR(.ramfunc)")
+zephyr_linker_symbol(SYMBOL __ramfunc_region_start EXPR "(@__ramfunc_start@)")
 zephyr_linker_symbol(SYMBOL __kernel_ram_start EXPR "(@__bss_start@)")
 zephyr_linker_symbol(SYMBOL __kernel_ram_end  EXPR "(${RAM_ADDR} + ${RAM_SIZE})")
 zephyr_linker_symbol(SYMBOL __kernel_ram_size EXPR "(@__kernel_ram_end@ - @__bss_start@)")