Fix sync by using 4.2.1r1.2 for hardware

Following repos aren't updated in AOSP yet:
hardware/broadcom/wlan
hardware/invensense
hardware/samsung_slsi/exynos5
hardware/ti/omap3
hardware/ti/omap4xxx
hardware/ti/wlan
hardware/ti/wpan

Use latest sources (4.2.1r1.2) for now to fix