cosmetic: doc: driver-model: Do not number driver lists

Everytime a dead driver is removed from the list,
we must re-number. This is a painful task.

Try
  git show e53232250 -- doc/driver-model/UDM-serial.txt
  git show 6f62f4207 -- doc/driver-model/UDM-serial.txt
  git show b9f4bc34a -- doc/driver-model/UDM-serial.txt
to see what I mean.

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
diff --git a/doc/driver-model/UDM-power.txt b/doc/driver-model/UDM-power.txt
index 015c773..666d553 100644
--- a/doc/driver-model/UDM-power.txt
+++ b/doc/driver-model/UDM-power.txt
@@ -52,8 +52,8 @@
 III) Analysis of in-tree drivers
 --------------------------------
 
-  1) ftpmu010.c
-  -------------
+  ftpmu010.c
+  ----------
   All methods of this file are moved to another location.
     void ftpmu010_32768osc_enable(void): Move to boards hacks
     void ftpmu010_mfpsr_select_dev(unsigned int dev): Move to board file
@@ -65,8 +65,8 @@
     void ftpmu010_sdramhtc_set(unsigned int val): Move to board file
 						  arch/nds32/lib/board.c
 
-  2) twl4030.c
-  ------------
+  twl4030.c
+  ---------
   All methods of this file are moved to another location.
     void twl4030_power_reset_init(void): Move to board hacks
     void twl4030_pmrecv_vsel_cfg(u8 vsel_reg, u8 vsel_val, u8 dev_grp,
@@ -74,8 +74,8 @@
     void twl4030_power_init(void): Move to board hacks
     void twl4030_power_mmc_init(void): Move to board hacks
 
-  3) twl6030.c
-  ------------
+  twl6030.c
+  ---------
   Some methods are converted to new API and rest are moved to another location.
     void twl6030_stop_usb_charging(void): Convert to new API
     void twl6030_start_usb_charging(void): Convert to new API