MAINTAINERS: rectify entry for ARM/HPE GXP ARCHITECTURE

Commit 8cc35b86 ("spi: dt-bindings: add documentation for
hpe,gxp-spifi") adds the spi dt-binding file hpe,gxp-spifi.yaml and commit
a1848b0f ("MAINTAINERS: add spi support to GXP") adds a file entry
hpe,gxp-spi.yaml in ARM/HPE GXP ARCHITECTURE. Note the different file name.

Hence, ./scripts/get_maintainer.pl --self-test=patterns complains about a
broken reference.

Repair this file reference in ARM/HPE GXP ARCHITECTURE.
Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Link: https://lore.kernel.org/r/20220804161823.20912-1-lukas.bulwahn@gmail.comSigned-off-by: Mark Brown <broonie@kernel.org>

MAINTAINERS

@@ -2140,7 +2140,7 @@ M:	Jean-Marie Verdun <verdun@hpe.com>
 M:	Nick Hawkins <nick.hawkins@hpe.com>
 S:	Maintained
 F:	Documentation/devicetree/bindings/arm/hpe,gxp.yaml
-F:	Documentation/devicetree/bindings/spi/hpe,gxp-spi.yaml
+F:	Documentation/devicetree/bindings/spi/hpe,gxp-spifi.yaml
 F:	Documentation/devicetree/bindings/timer/hpe,gxp-timer.yaml
 F:	arch/arm/boot/dts/hpe-bmc*
 F:	arch/arm/boot/dts/hpe-gxp*