ARM: shmobile: koelsch: Conditionally select MICREL_PHY for Multiplatform

The koelsch board uses has an SH ethernet controller which uses a Micrel
phy. Select MICREL_PHY for koelsch if SH_ETH is enabled to make use of the
Micrel-specific phy driver rather than relying on the generic phy driver.
Signed-off-by: NSimon Horman <horms+renesas@verge.net.au>

arch/arm/mach-shmobile/Kconfig

@@ -45,6 +45,7 @@ config MACH_GENMAI
 config MACH_KOELSCH
 	bool "Koelsch board"
 	depends on ARCH_R8A7791
+	select MICREL_PHY if SH_ETH
 
 config MACH_KZM9D
 	bool "KZM9D board"