spec: Move zynq-uart into its own object

Currently, zynq-uart code is always built and has some requirements for
BSPs that use it. Instead of making all BSPs satisfy that requirement or
working around it by setting defaults, this moves the zynq-uart code
into its own spec build object so it can be included if needed.

spec/build/bsps/aarch64/xilinx-zynqmp/grp.yml

@@ -31,6 +31,8 @@ links:
   uid: ../../obj
 - role: build-dependency
   uid: ../../objirq
+- role: build-dependency
+  uid: ../../objdevserialzynq
 - role: build-dependency
   uid: ../../optcachedata
 - role: build-dependency

spec/build/bsps/arm/xilinx-zynq/grp.yml

@@ -55,6 +55,8 @@ links:
   uid: ../../obj
 - role: build-dependency
   uid: ../../objirq
+- role: build-dependency
+  uid: ../../objdevserialzynq
 - role: build-dependency
   uid: linkcmds
 - role: build-dependency

spec/build/bsps/arm/xilinx-zynqmp/bspxilinxzynqmp.yml

@@ -67,6 +67,8 @@ links:
   uid: ../../obj
 - role: build-dependency
   uid: ../../objirq
+- role: build-dependency
+  uid: ../../objdevserialzynq
 - role: build-dependency
   uid: ../../opto2
 - role: build-dependency

spec/build/bsps/obj.yml

@@ -52,8 +52,6 @@ install:
   source:
   - bsps/include/dev/serial/arm-pl011-regs.h
   - bsps/include/dev/serial/arm-pl011.h
-  - bsps/include/dev/serial/zynq-uart-regs.h
-  - bsps/include/dev/serial/zynq-uart.h
 - destination: ${BSP_INCLUDEDIR}/rtems/zilog
   source:
   - bsps/include/rtems/zilog/z8036.h
@@ -96,8 +94,6 @@ source:
 - bsps/shared/dev/serial/ns16550.c
 - bsps/shared/dev/serial/ns16550-context.c
 - bsps/shared/dev/serial/serprobe.c
-- bsps/shared/dev/serial/zynq-uart.c
-- bsps/shared/dev/serial/zynq-uart-polled.c
 - bsps/shared/start/bootcard.c
 - bsps/shared/rtems-version.c
 type: build

spec/build/bsps/objdevserialzynq.yml

@@ -0,0 +1,19 @@
+SPDX-License-Identifier: CC-BY-SA-4.0 OR BSD-2-Clause
+build-type: objects
+cflags: []
+copyrights:
+- Copyright (C) 2020 On-Line Applications Research (OAR)
+cppflags: []
+cxxflags: []
+enabled-by: true
+includes: []
+install:
+- destination: ${BSP_INCLUDEDIR}/dev/serial
+  source:
+  - bsps/include/dev/serial/zynq-uart-regs.h
+  - bsps/include/dev/serial/zynq-uart.h
+links: []
+source:
+- bsps/shared/dev/serial/zynq-uart.c
+- bsps/shared/dev/serial/zynq-uart-polled.c
+type: build