nvmem: xilinx: zynqmp: make modular

This driver has a MODULE_LICENSE but is not tristate so cannot be
built as a module, unlike all its peers: make it modular to match.
Signed-off-by: Nick Alcock <nick.alcock@oracle.com>
Suggested-by: Michal Simek <michal.simek@amd.com>
Cc: Luis Chamberlain <mcgrof@kernel.org>
Cc: linux-modules@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: Hitomi Hasegawa <hasegawa-hitomi@fujitsu.com>
Cc: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Cc: Michal Simek <michal.simek@xilinx.com>
Cc: linux-arm-kernel@lists.infradead.org
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20230404172148.82422-4-srinivas.kandagatla@linaro.orgSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/nvmem/Kconfig

@@ -368,7 +368,7 @@ config NVMEM_VF610_OCOTP
 	  be called nvmem-vf610-ocotp.
 
 config NVMEM_ZYNQMP
-	bool "Xilinx ZYNQMP SoC nvmem firmware support"
+	tristate "Xilinx ZYNQMP SoC nvmem firmware support"
 	depends on ARCH_ZYNQMP
 	help
 	  This is a driver to access hardware related data like