mips: Remove obsolete configs IRQ_MSP_CIC and IRQ_MSP_SLP

Commit 1b00767f ("MIPS: Remove PMC MSP71xx platform") removes all uses
of the config IRQ_MSP_CIC and IRQ_MSP_SLP.

Remove these two obsolete configs IRQ_MSP_CIC and IRQ_MSP_SLP.
Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

arch/mips/Kconfig

@@ -1164,12 +1164,6 @@ config SYS_SUPPORTS_LITTLE_ENDIAN
 config MIPS_HUGE_TLB_SUPPORT
 	def_bool HUGETLB_PAGE || TRANSPARENT_HUGEPAGE
 
-config IRQ_MSP_SLP
-	bool
-
-config IRQ_MSP_CIC
-	bool
-
 config IRQ_TXX9
 	bool