dma: ti: k3-udma: Fix 'SZ_64K’ undeclared error

Include linux/sizes.h because it defines SZ_64K which is used in many
places inside k3-udma.c
This fixes the error: ‘SZ_64K’ undeclared which appears during build
time

Signed-off-by: Dhruva Gole <d-gole@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>