powerpc/85xx: mpc85xx_rdb: Do not automatically select FSL_ULI1575

Boards provided by CONFIG_MPC85xx_RDB option do not initialize
fsl_uli1575.c driver. So remove explicit select dependency on it.
Signed-off-by: Pali Rohár <pali@kernel.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20230409000812.18904-6-pali@kernel.org

arch/powerpc/platforms/85xx/Kconfig

@@ -90,7 +90,6 @@ config MPC85xx_RDB
 	bool "Freescale P102x MBG/UTM/RDB and P2020 RDB"
 	select PPC_I8259
 	select DEFAULT_UIMAGE
-	select FSL_ULI1575 if PCI
 	select SWIOTLB
 	help
 	  This option enables support for the P1020 MBG PC, P1020 UTM PC,