spi: meson-spicc: fix do_div build error on non-arm64

This fixes :
error: passing argument 1 of '__div64_32' from incompatible pointer type

By passing an uint64_t as first variable to do_div().

Reported-by: kernel test robot <[e-mail]>
Fixes: 04694e50020b ("spi: meson-spicc: move wait completion in driver to take bursts delay in account")
Acked-by: Martin Blumenstingl <[e-mail]>
Signed-off-by: Neil Armstrong <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Mark Brown <[e-mail]>

drivers/spi/spi-meson-spicc.c

···
 				    struct spi_transfer *xfer)
 {
 	struct meson_spicc_device *spicc = spi_master_get_devdata(master);
-	unsigned long timeout;
+	uint64_t timeout;
 
 	/* Store current transfer */
 	spicc->xfer = xfer;