feat(fvp_r): configure system registers to boot rich OS

Following system registers are modified before exiting EL2 to allow
u-boot/Linux to boot
  1. CNTHCTL_EL2.EL1PCTEN -> 1
     Allows U-boot to use physical counters at EL1
  2. VTCR_EL2.MSA -> 1
     Enables VMSA at EL1, which is required by U-Boot and Linux.
  3. HCR_EL2.APK = 1 & HCR_EL2.API = 1
     Disables PAuth instruction and register traps in EL1

Signed-off-by: Manish Pandey <manish.pandey2@arm.com>
Change-Id: I58f45b6669a9ad1debb80265b243015c054a9bb1
diff --git a/include/arch/aarch64/arch.h b/include/arch/aarch64/arch.h
index 1b3ae02..8333902 100644
--- a/include/arch/aarch64/arch.h
+++ b/include/arch/aarch64/arch.h
@@ -576,6 +576,10 @@
 #define CPTR_EL2_TZ_BIT		(U(1) << 8)
 #define CPTR_EL2_RESET_VAL	CPTR_EL2_RES1
 
+/* VTCR_EL2 definitions */
+#define VTCR_RESET_VAL         U(0x0)
+#define VTCR_EL2_MSA           (U(1) << 31)
+
 /* CPSR/SPSR definitions */
 #define DAIF_FIQ_BIT		(U(1) << 0)
 #define DAIF_IRQ_BIT		(U(1) << 1)
diff --git a/include/arch/aarch64/arch_helpers.h b/include/arch/aarch64/arch_helpers.h
index 72b87c8..359ac76 100644
--- a/include/arch/aarch64/arch_helpers.h
+++ b/include/arch/aarch64/arch_helpers.h
@@ -442,6 +442,8 @@
 DEFINE_SYSREG_READ_FUNC(cntpct_el0)
 DEFINE_SYSREG_RW_FUNCS(cnthctl_el2)
 
+DEFINE_SYSREG_RW_FUNCS(vtcr_el2)
+
 #define get_cntp_ctl_enable(x)  (((x) >> CNTP_CTL_ENABLE_SHIFT) & \
 					CNTP_CTL_ENABLE_MASK)
 #define get_cntp_ctl_imask(x)   (((x) >> CNTP_CTL_IMASK_SHIFT) & \