kernel/arch: remove zephyr,ccm initialization code

doc: dts: api: remove documentation of chosen `zephyr,ccm`

The `zephyr,ccm` chosen was an ST-specific property which has been replaced
by the generic `zephyr,dtcm`. Remove region initialization code from the
common arch init code (+ BSS zeroing from common XIP init code).

Signed-off-by: Mathieu Choplain <mathieu.choplain-ext@st.com>

arch/common/init.c

@@ -55,11 +55,6 @@ void arch_bss_zero(void)
 	}
 
 	arch_early_memset(__bss_start, 0, __bss_end - __bss_start);
-#if DT_NODE_HAS_STATUS_OKAY(DT_CHOSEN(zephyr_ccm))
-	arch_early_memset(&__ccm_bss_start, 0,
-		       (uintptr_t) &__ccm_bss_end
-		       - (uintptr_t) &__ccm_bss_start);
-#endif
 #if DT_NODE_HAS_STATUS_OKAY(DT_CHOSEN(zephyr_dtcm))
 	arch_early_memset(&__dtcm_bss_start, 0,
 		       (uintptr_t) &__dtcm_bss_end

arch/common/xip.c

@@ -38,10 +38,6 @@ void arch_data_copy(void)
 		       (uintptr_t) &_nocache_load_ram_size);
 #endif /* CONFIG_NOCACHE_MEMORY */
 #endif /* CONFIG_ARCH_HAS_NOCACHE_MEMORY_SUPPORT */
-#if DT_NODE_HAS_STATUS_OKAY(DT_CHOSEN(zephyr_ccm))
-	arch_early_memcpy(&__ccm_data_start, &__ccm_data_load_start,
-		       __ccm_data_end - __ccm_data_start);
-#endif
 #if DT_NODE_HAS_STATUS_OKAY(DT_CHOSEN(zephyr_itcm))
 	arch_early_memcpy(&__itcm_start, &__itcm_load_start,
 		       (uintptr_t) &__itcm_size);