MIPS: generic: Add support for zboot

There is no reason we can't create compressed kernels here, so select
the option SYS_SUPPORTS_ZBOOT.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index d96618c..1543059 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -141,6 +141,7 @@
 	select SYS_SUPPORTS_MULTITHREADING
 	select SYS_SUPPORTS_RELOCATABLE
 	select SYS_SUPPORTS_SMARTMIPS
+	select SYS_SUPPORTS_ZBOOT
 	select UHI_BOOT
 	select USB_EHCI_BIG_ENDIAN_DESC if CPU_BIG_ENDIAN
 	select USB_EHCI_BIG_ENDIAN_MMIO if CPU_BIG_ENDIAN