mmc: core: enable BRCM_PATCH only for P1

This is causing Wi-Fi problem for some galaxysmtd users.

Change-Id: I83de1b0bd412341fbf1db53959394c2ccecd351a
JIRA: CYAN-1572
Merge branch 'cm-10.2' of https://github.com/CyanogenMod/android_kernel_samsung_aries into cm-10.2-ypg1-dev