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/cpu.c b/arch/arm/cpu/armv8/fsl-layerscape/cpu.c
index 3bdeb0e..335f225 100644
--- a/arch/arm/cpu/armv8/fsl-layerscape/cpu.c
+++ b/arch/arm/cpu/armv8/fsl-layerscape/cpu.c
@@ -412,7 +412,7 @@
 #endif
 #ifdef CONFIG_MP
 #if defined(CONFIG_ARMV8_SEC_FIRMWARE_SUPPORT) && \
-	defined(CONFIG_FSL_PPA_ARMV8_PSCI)
+	defined(CONFIG_SEC_FIRMWARE_ARMV8_PSCI)
 	/* Check the psci version to determine if the psci is supported */
 	psci_ver = sec_firmware_support_psci_version();
 #endif