Move timer from os to base repository

Since the timer and timeout handling is part of the base library (the
dynamic linker), it belongs to the base repository.

Besides moving the timer and its related infrastructure (alarm, timeout
libs, tests) to the base repository, this patch also moves the timer
from the 'drivers' subdirectory directly to 'src' and disamibuates the
timer's build locations for the various kernels. Otherwise the different
timer implementations could interfere with each other when using one
build directory with multiple kernels.

Note that this patch changes the include paths for the former os/timer,
os/alarm.h, os/duration.h, and os/timed_semaphore.h to base/.

Issue #3101

repos/dde_rump/run/fs_rom_update_ext2.run

@@ -2,10 +2,9 @@
 # Build
 #
 set build_components {
-	core init
+	core init timer
 	app/rom_logger
 	app/rom_to_file
-	drivers/timer
 	lib/vfs/rump
 	server/dynamic_rom
 	server/fs_rom

repos/dde_rump/run/rump_ext2.run

@@ -12,8 +12,7 @@ set dd     [installed_command dd]
 # Build
 #
 set build_components {
-	core init
-	drivers/timer
+	core init timer
 	server/ram_blk
 	server/rump_fs
 	test/libc_vfs

repos/dde_rump/run/rump_fat.run

@@ -12,8 +12,7 @@ set dd   [installed_command dd]
 # Build
 #
 set build_components {
-	core init
-	drivers/timer
+	core init timer
 	server/ram_blk
 	server/rump_fs
 	test/libc_vfs

repos/dde_rump/run/rump_iso.run

@@ -11,8 +11,7 @@ set mkisofs [installed_command mkisofs]
 # Build
 #
 set build_components {
-	core init
-	drivers/timer
+	core init timer
 	server/fs_rom
 	server/rom_blk
 	server/rump_fs

repos/dde_rump/run/vfs_stress_ext2.run

@@ -10,7 +10,7 @@
 set mke2fs [installed_command mke2fs]
 set dd     [installed_command dd]
 
-build "core init drivers/timer test/vfs_stress server/ram_blk lib/vfs/rump"
+build "core init timer test/vfs_stress server/ram_blk lib/vfs/rump"
 
 #
 # Build EXT2-file-system image

repos/dde_rump/run/vfs_stress_rump_fs.run

@@ -10,7 +10,7 @@
 set mke2fs [installed_command mke2fs]
 set dd     [installed_command dd]
 
-build "core init drivers/timer test/vfs_stress server/ram_blk server/rump_fs"
+build "core init timer test/vfs_stress server/ram_blk server/rump_fs"
 
 #
 # Build EXT2-file-system image