bsps/sparc: Remove set_vector() usage and implementation

Removed all uses and implementations of set_vector() function across ERC32,
LEON2, and LEON3 BSPs. Replaced with rtems_interrupt_handler_install() and
rtems_interrupt_entry_install().

- Added ERC32_Clear_and_unmask_interrupt() and LEON_Clear_and_unmask_interrupt()
  for unmasking logic previously in set_vector().
- Deleted set_vector() definitions and implementations in each BSP.
- Updated related obj.yml files.
- Replaced set_vector() with rtems_interrupt_catch() in shared/gnatcommon.c.

spec/build/bsps/sparc/erc32/bsperc32.yml

@@ -63,7 +63,7 @@ source:
 - bsps/sparc/erc32/start/bspidle.c
 - bsps/sparc/erc32/start/bspstart.c
 - bsps/sparc/erc32/start/erc32mec.c
-- bsps/sparc/erc32/start/setvec.c
+- bsps/sparc/shared/start/sparctrap.c
 - bsps/sparc/shared/gnatcommon.c
 - bsps/sparc/shared/irq/bsp_isr_handler.c
 - bsps/sparc/shared/irq/irq-shared.c

spec/build/bsps/sparc/leon2/obj.yml

@@ -29,6 +29,7 @@ source:
 - bsps/shared/irq/irq-default-handler.c
 - bsps/shared/start/gettargethash-default.c
 - bsps/shared/start/sbrk.c
+- bsps/sparc/shared/start/sparctrap.c
 - bsps/sparc/leon2/btimer/btimer.c
 - bsps/sparc/leon2/clock/ckinit.c
 - bsps/sparc/leon2/console/console.c
@@ -39,7 +40,6 @@ source:
 - bsps/sparc/leon2/start/bspidle.c
 - bsps/sparc/leon2/start/bspstart.c
 - bsps/sparc/leon2/start/cache.c
-- bsps/sparc/leon2/start/setvec.c
 - bsps/sparc/shared/drvmgr/ambapp_bus_leon2.c
 - bsps/sparc/shared/drvmgr/leon2_amba_bus.c
 - bsps/sparc/shared/gnatcommon.c

spec/build/bsps/sparc/leon3/obj.yml

@@ -36,6 +36,7 @@ source:
 - bsps/shared/dev/serial/console-termios.c
 - bsps/shared/irq/irq-default-handler.c
 - bsps/shared/start/sbrk.c
+- bsps/sparc/shared/start/sparctrap.c
 - bsps/sparc/leon3/btimer/btimer.c
 - bsps/sparc/leon3/btimer/watchdog.c
 - bsps/sparc/leon3/clock/ckinit.c
@@ -51,7 +52,6 @@ source:
 - bsps/sparc/leon3/start/drvmgr_def_drivers.c
 - bsps/sparc/leon3/start/eirq.c
 - bsps/sparc/leon3/start/gettargethash.c
-- bsps/sparc/leon3/start/setvec.c
 - bsps/sparc/shared/gnatcommon.c
 - bsps/sparc/shared/irq/bsp_isr_handler.c
 - bsps/sparc/shared/pci/gr_cpci_gr740.c