Revert "s6evr02: Allow max brightness at 255"

This reverts commit 5791fbea2f8c4c0664927e14bb2e3d4d4b747801.
Revert "ea8061: Allow manual brightness to 300 candela"

This reverts commit febdb1a39a33d25362d528675fa98b4a2e4544bf.
Revert "s6e8aa0: Allow manual brightness to 300 candela"

This reverts commit cc304ab036e7cadcd031ffeda34a0c86abedceae.
Revert "bcmdhd: KEEP_ALIVE_PERIOD 줄임"

This reverts commit df82a32185ddeaf85b7626e390882e4457e1a929.