[PATCH] I2C: Spelling fixes for drivers/i2c/algos/i2c-algo-pca.c

This patch fixes the some misspellings and a trailing whitespace in
the comments.

Signed-off-by: Tobias Klauser <tklauser@nuerscht.ch>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>