drivers/leds/leds-lp5521.c: redefinition of register bits

For better readability, values of LP5521_REG_ENABLE register were
redefined= .  Additional definitions: LP5521_ENABLE_DEFAULT and
LP5521_ENABLE_RUN_PROGRAM= .

Use definition rather than hard code value.
: 0x3F -> 'LP5521_CMD_DIRECT'

Signed-off-by: Milo(Woogyom) Kim <milo.kim@ti.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Cc: Arun MURTHY <arun.murthy@stericsson.com>
Cc: Srinidhi Kasagar <srinidhi.kasagar@stericsson.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>