spi: spi-sn-f-ospi: Make read-only array `width_available` static const

The `width_available` array is currently placed on the
`f_ospi_supports_op_width()` function's stack.

But the array is never modified. Make it `static const`. This makes the
code slightly smaller and more efficient.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Link: https://lore.kernel.org/r/20230528195830.164669-3-lars@metafoo.de
Signed-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi-sn-f-ospi.c

@@ -526,7 +526,7 @@ static int f_ospi_exec_op(struct spi_mem *mem, const struct spi_mem_op *op)
 static bool f_ospi_supports_op_width(struct spi_mem *mem,
 				     const struct spi_mem_op *op)
 {
-	u8 width_available[] = { 0, 1, 2, 4, 8 };
+	static const u8 width_available[] = { 0, 1, 2, 4, 8 };
 	u8 width_op[] = { op->cmd.buswidth, op->addr.buswidth,
 			  op->dummy.buswidth, op->data.buswidth };
 	bool is_match_found;