ARM: dts: msm: Specify WLED device configuration for PM855L

Specify the device configuration for WLED peripheral that is
present on PM855L and used on sdm855 platforms. Keep the device
disabled as it should be enabled for platforms with the right
string configuration.

Change-Id: I20957fb4d75712b5fd73338f6884785afa9b7a83
Signed-off-by: Subbaraman Narayanamurthy <subbaram@codeaurora.org>