arm64: dts: ti: k3-j721s2-evm-gesi: Specify base dtb for overlay file

arm64: dts: ti: k3-j721s2-evm-gesi: Specify base dtb for overlay file

Specify the base dtb file k3-j721s2-common-proc-board.dtb on which the
k3-j721s2-evm-gesi-exp-board.dtbo overlay has to be applied. Name the
resulting dtb as k3-j721s2-evm.dtb.

Fixes: cac04e27f093 ("arm64: dts: ti: k3-j721s2: Add overlay to enable main CPSW2G with GESI")
Reported-by: Rob Herring <robh+dt@kernel.org>
Signed-off-by: Siddharth Vadapalli <s-vadapalli@ti.com>
Link: https://lore.kernel.org/r/20230912043308.20629-1-s-vadapalli@ti.com
Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>