Revert "LP5521 LED: Add slow blink mode for button-backlight LED"

This reverts commit 1263173e40074df990f4d7ff9c3cbf0e9f7476d7.

Conflicts:
	drivers/leds/leds-lp5521_htc.c

Conflicts:
	arch/arm/configs/nextcpuquiet_aosp_defconfig
	arch/arm/configs/nextcpuquiet_sense_defconfig
	drivers/leds/leds-lp5521_htc.c

Conflicts:
	drivers/leds/leds-lp5521_htc.c

Change-Id: I0a7d329d56f93704f94e0b983530c2c746aa96db