mfd: rp1: depends on PCI_MSI

The driver uses pci_msi methods, only defined when CONFIG_PCI_MSI symbol
is set, and cannot be compiled without. Therefore, it depends on this
symbol.

Signed-off-by: Jorge Marques <jorge.marques@analog.com>

Author: gastmaier

drivers/mfd/Kconfig

@@ -2436,6 +2436,7 @@ config MFD_QNAP_MCU
 config MFD_RP1
 	tristate "RP1 MFD driver"
 	depends on PCI
+	depends on PCI_MSI
 	select MFD_CORE
 	help
 	  Support for the RP1 peripheral chip.