spi: SPI_QPIC_SNAND should be tristate and depend on MTD

SPI_QPIC_SNAND is the only driver that selects MTD instead of depending
on it, which could lead to circular dependencies.  Moreover, as
SPI_QPIC_SNAND is bool, this forces MTD (and various related symbols) to
be built-in, as can be seen in an allmodconfig kernel.

Except for a missing semicolon, there is no reason why SPI_QPIC_SNAND
cannot be tristate; all MODULE_*() boilerplate is already present.
Hence make SPI_QPIC_SNAND tristate, let it depend on MTD, and add the
missing semicolon.

Fixes: 7304d190 ("spi: spi-qpic: add driver for QCOM SPI NAND flash Interface")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://patch.msgid.link/b63db431cbf35223a4400e44c296293d32c4543c.1742998909.git.geert+renesas@glider.be


Signed-off-by: Mark Brown <broonie@kernel.org>