tsec: Don't disable HOST1x clock because it's used

Tsec keys function always disabled host1x clock after running.
This interferes with display interface and disables further window frame syncing.
Display_end code already handles disable and reset of said clock.

It also fixes an ancient bug that was mitigated by removing the 5 frame sync on HOST1X_SYNC_SYNCPT_9 at channel 0:
https://github.com/CTCaer/hekate/commit/5fd9daa3642216ae8a28f6cb662a262e29e7ce06#diff-6b0c56eab8515465d559ff0ea73a22c3L152

bootloader/soc/t210.h

@@ -101,6 +101,11 @@
 #define CL_DVFS(off) _REG(CL_DVFS_BASE, off)
 #define TEST_REG(off) _REG(0x0, off)
 
+/* HOST1X registers. */
+#define HOST1X_CH0_SYNC_BASE 0x2100
+#define HOST1X_CH0_SYNC_SYNCPT_9   (HOST1X_CH0_SYNC_BASE + 0xFA4)
+#define HOST1X_CH0_SYNC_SYNCPT_160 (HOST1X_CH0_SYNC_BASE + 0x1200)
+
 /*! EVP registers. */
 #define EVP_CPU_RESET_VECTOR 0x100