hwmon: (mcp3021) Convert to use devm_ functions
hwmon: (mcp3021) Convert to use devm_ functions

Convert to use devm_ functions to reduce code size and simplify the code.

Cc: Mingkai Hu <0f7a4b0e5837bbf73b1181bb27fe9dd77cd3ff1c@freescale.com>
Cc: Xie Xiaobo <946e04a86091d970f37840fbd689bb7c562f8fe8@freescale.com>
Signed-off-by: Guenter Roeck <ba324ca7b1c77fc20bb970d5aff6eea9377918a5@roeck-us.net>

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