pinctrl: qcom: add gpio and correct function names for mdmcalifornium

add gpio function as default and correct function name
inconsistencies present in uart, spi and i2c

Change-Id: Ie8a31312e3e8120f460bf5bff19a2d738859ef04
Signed-off-by: Sanrio Alvares <salvares@codeaurora.org>