MAINTAINERS: Add entry for drivers/acpi/riscv

ACPI defines few RISC-V specific tables which need
parsing code added in drivers/acpi/riscv. Add maintainer
entries for this newly created folder.
Signed-off-by: Sunil V L <sunilvl@ventanamicro.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Link: https://lore.kernel.org/r/20230515054928.2079268-22-sunilvl@ventanamicro.comSigned-off-by: Palmer Dabbelt <palmer@rivosinc.com>

MAINTAINERS

@@ -412,6 +412,13 @@ L:	platform-driver-x86@vger.kernel.org
 S:	Maintained
 F:	drivers/platform/x86/serial-multi-instantiate.c
 
+ACPI FOR RISC-V (ACPI/riscv)
+M:	Sunil V L <sunilvl@ventanamicro.com>
+L:	linux-acpi@vger.kernel.org
+L:	linux-riscv@lists.infradead.org
+S:	Maintained
+F:	drivers/acpi/riscv/
+
 ACPI PCC(Platform Communication Channel) MAILBOX DRIVER
 M:	Sudeep Holla <sudeep.holla@arm.com>
 L:	linux-acpi@vger.kernel.org