fix: update doc to remove deprecated MTE build flag

Replaced CTX_INCLUDE_MTE_REGS with ENABLE_FEAT_MTE as recommended by
TF-A.

Signed-off-by: Madhukar Pappireddy <madhukar.pappireddy@arm.com>
Change-Id: I948223d746ff766d299eeb75438c0d200bec1abf
1 file changed
tree: 4fbbc15447d1650cfa9e28a41d7236748c1303ba
  1. darwin-x64/
  2. generic/
  3. linux-aarch64/
  4. linux-x64/