[clock_time] Remove old subsystems and update to use only clock_time

- Deleted ktime, cputime, and hwtimer directories completely
- Removed old header files (ktime.h, cputime.h, cputimer.h, hwtimer.h)
- Updated ctime.c to only use RT_USING_CLOCK_TIME (removed RT_USING_KTIME conditionals)
- Updated main drivers Kconfig to remove old subsystem entries
- Added all legacy API declarations to clock_time.h when compatibility is enabled
- Added legacy type definitions (rt_clock_cputime_ops, rt_cputimer) to clock_time.h
- Removed ktime.h include from ktime_compat.c (types now in clock_time.h)
- All POSIX time APIs (clock_gettime, clock_settime, timer_create, etc.) continue to work

Co-authored-by: BernardXiong <[email protected]>

Author: Copilot

components/drivers/Kconfig

@@ -6,7 +6,6 @@ rsource "ipc/Kconfig"
 rsource "serial/Kconfig"
 rsource "can/Kconfig"
 rsource "clock_time/Kconfig"
-rsource "cputime/Kconfig"
 rsource "i2c/Kconfig"
 rsource "phy/Kconfig"
 rsource "misc/Kconfig"
@@ -40,9 +39,7 @@ rsource "pci/Kconfig"
 rsource "pic/Kconfig"
 rsource "pin/Kconfig"
 rsource "pinctrl/Kconfig"
-rsource "ktime/Kconfig"
 rsource "clk/Kconfig"
-rsource "hwtimer/Kconfig"
 rsource "usb/Kconfig"
 
 endmenu

components/drivers/clock_time/src/ktime_compat.c

@@ -12,9 +12,8 @@
 #include <rthw.h>
 #include <sys/time.h>
 #include <drivers/clock_time.h>
-#include <ktime.h>
 
-/* Legacy ktime API wrappers */
+/* Legacy ktime API wrappers - all types defined in clock_time.h */
 
 rt_err_t rt_ktime_boottime_get_us(struct timeval *tv)
 {