lib: sbi: Simplify ipi platform operations

Instead of having ipi_send() and ipi_clear() callbacks in
platform operations, it will be much simpler for ipi driver
to directly register these operations as a device to sbi_ipi
implementation.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>

lib/utils/ipi/fdt_ipi_clint.c

@@ -45,6 +45,4 @@ struct fdt_ipi fdt_ipi_clint = {
 	.cold_init = ipi_clint_cold_init,
 	.warm_init = clint_warm_ipi_init,
 	.exit = NULL,
-	.send = clint_ipi_send,
-	.clear = clint_ipi_clear,
 };