mtd: trivial sh_flctl changes

This patch contains a few changes for the sh_flctl driver:
 - not sh7723-only driver - get rid of kconfig dependency
 - use dev_err() instead of printk()
 - use __devinit and __devexit for probe()/remove()
 - fix probe() return values

Signed-off-by: Magnus Damm <damm@opensource.se>
Acked-by: Yoshihiro Shimoda <shimoda.yoshihiro@renesas.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>