Disable processor Cycle Counting in Secure state

In a system with ARMv8.5-PMU implemented:

- If EL3 is using AArch32, setting MDCR_EL3.SCCD to 1 disables counting
  in Secure state in PMCCNTR.

- If EL3 is using AArch64, setting SDCR.SCCD to 1 disables counting in
  Secure state in PMCCNTR_EL0.

So far this effect has been achieved by setting PMCR_EL0.DP (in AArch64)
or PMCR.DP (in AArch32) to 1 instead, but this isn't considered secure
as any EL can change that value.

Change-Id: I82cbb3e48f2e5a55c44d9c4445683c5881ef1f6f
Signed-off-by: Antonio Nino Diaz <antonio.ninodiaz@arm.com>
diff --git a/include/arch/aarch32/arch.h b/include/arch/aarch32/arch.h
index 3421e04..2aa6eff 100644
--- a/include/arch/aarch32/arch.h
+++ b/include/arch/aarch32/arch.h
@@ -153,6 +153,7 @@
 #define SDCR_SPD_LEGACY		U(0x0)
 #define SDCR_SPD_DISABLE	U(0x2)
 #define SDCR_SPD_ENABLE		U(0x3)
+#define SDCR_SCCD_BIT		(U(1) << 23)
 #define SDCR_RESET_VAL		U(0x0)
 
 /* HSCTLR definitions */