Removing dead MACH_U300_BS26

MACH_U300_BS26 doesn't exist in Kconfig, therefore removing all
references for it from the source code.

Signed-off-by: Christoph Egger <[e-mail]>
Acked-by: Linus Walleij <[e-mail]>
Signed-off-by: Jiri Kosina <[e-mail]>

arch/arm/mach-u300/core.c

···
 	printk(KERN_INFO "Initializing U300 system on %s baseband chip " \
 	       "(chip ID 0x%04x)\n", chipname, val);
 
-#ifdef CONFIG_MACH_U300_BS26
-	if ((val & 0xFF00U) != 0xc800) {
-		printk(KERN_ERR "Platform configured for BS25/BS26 " \
-		       "with DB3150 but %s detected, expect problems!",
-		       chipname);
-	}
-#endif
 #ifdef CONFIG_MACH_U300_BS330
 	if ((val & 0xFF00U) != 0xd800) {
 		printk(KERN_ERR "Platform configured for BS330 " \