There are gpio pins reserved for special usages and those pins are
prohibited from read by HLOS such as Linux Kernel. Add no_read field
in pinctrl_pin_desc structure to earmark such usage. When dump gpio
information through debugfs /d/gpio, those pins will be skipped.
Bug 73898164
Change-Id: I1bda1255c84831e88d6afcf82eac7ec6292933e0
Signed-off-by: Wen Yi <weyi@google.com>