arm64: dts: ti: k3-am64-main: Add SPI DT nodes in main domain

commit 2fd29affa7dec988961349e4d047883581d7e801 from
git://git.ti.com/ti-linux-kernel/ti-linux-kernel.git



Add device tree nodes for SPI subsystems in main domain.

Signed-off-by: Aswath Govindraju <a-govindraju@ti.com>
Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>
Signed-off-by: Xulin Sun <xulin.sun@windriver.com>