soc: nordic: nrf54h: Remove redundant ICACHE kconfig

Remove CONFIG_NRF_ENABLE_ICACHE as it is not needed. There is CONFIG_ICACHE
which is by default enabled for nrf54h.

Signed-off-by: Krzysztof Chruściński <krzysztof.chruscinski@nordicsemi.no>

soc/nordic/nrf54h/Kconfig

@@ -31,11 +31,3 @@ config SOC_NRF54H20_CPURAD
 
 config SOC_NRF54H20_CPUPPR
 	depends on RISCV_CORE_NORDIC_VPR
-
-if SOC_NRF54H20
-
-config NRF_ENABLE_ICACHE
-	bool "Instruction cache (I-Cache)"
-	default y
-
-endif # SOC_NRF54H20

soc/nordic/nrf54h/soc.c

@@ -82,9 +82,7 @@ static int trim_hsfll(void)
 
 static int nordicsemi_nrf54h_init(void)
 {
-#if defined(CONFIG_NRF_ENABLE_ICACHE)
 	sys_cache_instr_enable();
-#endif
 
 	power_domain_init();