defconfig: arm64: Enable MMC performance profiling for SDM845

This change enables MMC performance profiling for SDM845.
With this enabled, support will be added for collecting
performance numbers at the MMC Queue and Host layers.

Change-Id: I5977a1bc8bc7334f9f5264462aa1f7b6a4789c03
Signed-off-by: Can Guo <cang@codeaurora.org>