ec/acpi: Remove empty "chip" driver

There was no code attached to this driver and hence one couldn't hook
it up to any device. Even if mentioned in the `devicetree.cb` it was
still dead code.

Change-Id: I12415ea9e0120b1d00524f8f39f9b2d02f46ba05
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/57431
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

src/ec/acpi/ec.c

@@ -148,7 +148,3 @@ void ec_set_ports(u16 cmd_reg, u16 data_reg)
 	ec_cmd_reg = cmd_reg;
 	ec_data_reg = data_reg;
 }
-
-struct chip_operations ec_acpi_ops = {
-	CHIP_NAME("ACPI Embedded Controller")
-};

src/mainboard/getac/p470/devicetree.cb

@@ -123,8 +123,6 @@ chip northbridge/intel/i945
 					end
 					device pnp 4e.b off		# HWM
 					end
-					chip ec/acpi
-					end
 				end
 
 			end

src/mainboard/roda/rk886ex/devicetree.cb

@@ -99,9 +99,6 @@ chip northbridge/intel/i945
 					device pnp ff.1 on # dummy address
 					end
 				end
-				chip ec/acpi
-				end
-
 			end
 			device pci 1f.1 off end # IDE
 			device pci 1f.2 on  end # SATA