MAINTAINERS: adjust the file entry in SPI OFFLOAD

Commit 8e02d18 ("spi: add basic support for SPI offloading") adds a
new MAINTAINERS section referring to the non-existent file
include/linux/spi/spi-offload.h rather than referring to the files added
with this commit in the directory include/linux/spi/offload/.

Adjust the file reference to the intended directory.

Fixes: 8e02d18 ("spi: add basic support for SPI offloading")

Signed-off-by: Lukas Bulwahn <lukas.bulwahn@redhat.com>
Reviewed-by: David Lechner <dlechner@baylibre.com>
Link: https://patch.msgid.link/20250217092851.17619-1-lukas.bulwahn@redhat.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: bulwahn

MAINTAINERS

@@ -22299,7 +22299,7 @@ SPI OFFLOAD
 R:	David Lechner <dlechner@baylibre.com>
 F:	drivers/spi/spi-offload-trigger-pwm.c
 F:	drivers/spi/spi-offload.c
-F:	include/linux/spi/spi-offload.h
+F:	include/linux/spi/offload/
 K:	spi_offload
 
 SPI SUBSYSTEM