gpio/langwell: cleanup driver
gpio/langwell: cleanup driver

This patch cleans up cosmetic issues, remove useless functions and add
to_lnw_priv() macro to replace many usages of container_of().

Signed-off-by: David Cohen <c031177e4d219c7dd6e3090d8fbcd121f5ab192c@intel.com>
Signed-off-by: Grant Likely <9069e6f5a2b566e2674a0ba1e2bf39c12c195fad@secretlab.ca>

KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs