[Hafnium] CPTR_EL2 configuration

Hi,

Hafnium sets CPTR_EL2.TTA (bit 28), which traps accesses to trace system registers to EL2. https://git.trustedfirmware.org/hafnium/hafnium.git/tree/src/arch/aarch64/sy...

However CPTR_EL2 register has a different bit field definition depending on HCR_EL2.E2H state. When HCR_EL2.E2H=0 (Hafnium case) CPTR_EL2.TTA bit position is 20.

Is this a slight issue needing fix?

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