refactor(cpufeat): rename ENABLE_SPE_FOR_LOWER_ELS to ENABLE_SPE_FOR_NS

At the moment we hardcode the SPE functionality to be available on the
non-secure side only, by setting MDCR_EL2.E2PB accordingly.

This should be reflected in the feature selection symbol, so rename that
to ENABLE_SPE_FOR_NS, to make it clearer that SPE is not supported in
the secure world.

Change-Id: I3f9b48eab1a45d6ccfcbb9c90a11eeb66867ad9a
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
diff --git a/plat/allwinner/common/allwinner-common.mk b/plat/allwinner/common/allwinner-common.mk
index 61c1dbe..3164a25 100644
--- a/plat/allwinner/common/allwinner-common.mk
+++ b/plat/allwinner/common/allwinner-common.mk
@@ -87,7 +87,7 @@
 COLD_BOOT_SINGLE_CPU		:=	1
 
 # Do not enable SPE (not supported on ARM v8.0).
-ENABLE_SPE_FOR_LOWER_ELS	:=	0
+ENABLE_SPE_FOR_NS		:=	0
 
 # Do not enable SVE (not supported on ARM v8.0).
 ENABLE_SVE_FOR_NS		:=	0
diff --git a/plat/arm/board/fvp/fvp_pm.c b/plat/arm/board/fvp/fvp_pm.c
index 6b9d618..9d93862 100644
--- a/plat/arm/board/fvp/fvp_pm.c
+++ b/plat/arm/board/fvp/fvp_pm.c
@@ -53,7 +53,7 @@
 {
 	uint64_t mpidr = read_mpidr_el1();
 
-#if ENABLE_SPE_FOR_LOWER_ELS
+#if ENABLE_SPE_FOR_NS
 	/*
 	 * On power down we need to disable statistical profiling extensions
 	 * before exiting coherency.
diff --git a/plat/arm/board/tc/platform.mk b/plat/arm/board/tc/platform.mk
index 05dca91..5f4148c 100644
--- a/plat/arm/board/tc/platform.mk
+++ b/plat/arm/board/tc/platform.mk
@@ -161,7 +161,7 @@
 
 override CTX_INCLUDE_PAUTH_REGS	:= 1
 
-override ENABLE_SPE_FOR_LOWER_ELS	:= 0
+override ENABLE_SPE_FOR_NS	:= 0
 
 override ENABLE_AMU := 1
 override ENABLE_AMU_AUXILIARY_COUNTERS := 1
diff --git a/plat/qti/msm8916/platform.mk b/plat/qti/msm8916/platform.mk
index e516cea..60fb25d 100644
--- a/plat/qti/msm8916/platform.mk
+++ b/plat/qti/msm8916/platform.mk
@@ -44,7 +44,7 @@
 
 # Disable features unsupported in ARMv8.0
 ENABLE_AMU			:= 0
-ENABLE_SPE_FOR_LOWER_ELS	:= 0
+ENABLE_SPE_FOR_NS		:= 0
 ENABLE_SVE_FOR_NS		:= 0
 
 # MSM8916 uses ARM Cortex-A53 r0p0 so likely all the errata apply