ARMv8/sec_firmware: relocated and renamed the config FSL_PPA_ARMV8_PSCI

Moved the config FSL_PPA_ARMV8_PSCI from fsl-layerscape's Kconfig to
Kconfig under armv8 and renamed it to SEC_FIRMWARE_ARMV8_PSCI.

Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
Reviewed-by: York Sun <york.sun@nxp.com>
diff --git a/arch/arm/cpu/armv8/fsl-layerscape/fdt.c b/arch/arm/cpu/armv8/fsl-layerscape/fdt.c
index dae9605..26d4a30 100644
--- a/arch/arm/cpu/armv8/fsl-layerscape/fdt.c
+++ b/arch/arm/cpu/armv8/fsl-layerscape/fdt.c
@@ -43,7 +43,7 @@
 	u64 val, core_id;
 	size_t *boot_code_size = &(__secondary_boot_code_size);
 #if defined(CONFIG_ARMV8_SEC_FIRMWARE_SUPPORT) && \
-	defined(CONFIG_FSL_PPA_ARMV8_PSCI)
+	defined(CONFIG_SEC_FIRMWARE_ARMV8_PSCI)
 	int node;
 	u32 psci_ver;