staging: remove reference to cs5535_gpio makefile
staging: remove reference to cs5535_gpio makefile

The driver was removed but 'make clean' still failed:

scripts/Makefile.clean:17:
[...]/drivers/staging/cs5535_gpio/Makefile: No such file or directory
make[3]: *** No rule to make target
`[...]/drivers/staging/cs5535_gpio/Makefile'.  Stop.

Signed-off-by: Kalle Valo <7081a7d99b8c74c0698a728df19e3915a995d7e1@qca.qualcomm.com>
Signed-off-by: Greg Kroah-Hartman <4645f7897fd33786a2ee1264d590b3c400559d85@suse.de>

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