gpio: rename pca953x symbols

This second part of an extension to support more pca953x chips renames the C
and Kconfig symbols.  All affected files were updated by sed, except for a
couple of obvious exceptions.  It also updates the Kconfig helptext.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@pengutronix.de>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/include/linux/i2c/pca953x.h b/include/linux/i2c/pca953x.h
index 611d84a..3c73612 100644
--- a/include/linux/i2c/pca953x.h
+++ b/include/linux/i2c/pca953x.h
@@ -1,6 +1,6 @@
 /* platform data for the PCA9539 16-bit I/O expander driver */
 
-struct pca9539_platform_data {
+struct pca953x_platform_data {
 	/* number of the first GPIO */
 	unsigned	gpio_base;