Add two missing chipsets to drivers/ide/ide-proc.c

Compiling with '-Wswitch-enum' I noticed following:

  CC      drivers/ide/ide-proc.o
drivers/ide/ide-proc.c: In function â\80\98proc_ide_read_imodelâ\80\99:
drivers/ide/ide-proc.c:54: warning: enumeration value â\80\98ide_etrax100â\80\99 not handled in switch
drivers/ide/ide-proc.c:54: warning: enumeration value â\80\98ide_acornâ\80\99 not handled in switch

How about the following patch?

Signed-off-by: Mika Kukkonen <mikukkon@iki.fi>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>