[MIPS] IP22: Fix ISA driver builds if CONFIG_EISA is selected.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/Kconfig

@@ -555,6 +555,7 @@ config SGI_IP22
 	select HW_HAS_EISA
 	select IP22_CPU_SCACHE
 	select IRQ_CPU
+	select NO_ISA if ISA
 	select SWAP_IO_SPACE
 	select SYS_HAS_CPU_R4X00
 	select SYS_HAS_CPU_R5000
@@ -1710,6 +1711,9 @@ source "drivers/pci/Kconfig"
 config ISA
 	bool
 
+config NO_ISA
+	bool
+
 config EISA
 	bool "EISA support"
 	depends on HW_HAS_EISA