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Previously the definition of `plat_get_syscnt_freq2()` in `arm_common.c` was
conditionally defined based on the ERROR_DEPRECATED flag. This patch makes
this function available irrespective of the flag and removes the deprecated
`plat_get_syscnt_freq()` definition.

Change-Id: I250ca787ca1b5e867096c6ba8f2bb444db44c97b