docs: memory-devices: convert ti-emif.txt to ReST

Prepare this file to be moved to a kernel book by converting
it to ReST format and renaming it to ti-emif.rst.

While this is not part of any book, mark it as :orphan:, in order
to avoid build warnings.
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

Documentation/memory-devices/ti-emif.txt → Documentation/memory-devices/ti-emif.rst

-TI EMIF SDRAM Controller Driver:
+:orphan:
+
+===============================
+TI EMIF SDRAM Controller Driver
+===============================
 
 Author
-========
+======
 Aneesh V <aneesh@ti.com>
 
 Location
-============
+========
 driver/memory/emif.c
 
 Supported SoCs:
-===================
+===============
 TI OMAP44xx
 TI OMAP54xx
 
 Menuconfig option:
-==========================
+==================
 Device Drivers
 	Memory devices
 		Texas Instruments EMIF driver
@@ -29,10 +33,11 @@ functions of the driver includes re-configuring AC timing
 parameters and other settings during frequency, voltage and
 temperature changes
 
-Platform Data (see include/linux/platform_data/emif_plat.h):
-=====================================================================
+Platform Data (see include/linux/platform_data/emif_plat.h)
+===========================================================
 DDR device details and other board dependent and SoC dependent
 information can be passed through platform data (struct emif_platform_data)
+
 - DDR device details: 'struct ddr_device_info'
 - Device AC timings: 'struct lpddr2_timings' and 'struct lpddr2_min_tck'
 - Custom configurations: customizable policy options through
@@ -40,17 +45,19 @@ information can be passed through platform data (struct emif_platform_data)
 - IP revision
 - PHY type
 
-Interface to the external world:
-================================
+Interface to the external world
+===============================
 EMIF driver registers notifiers for voltage and frequency changes
 affecting EMIF and takes appropriate actions when these are invoked.
+
 - freq_pre_notify_handling()
 - freq_post_notify_handling()
 - volt_notify_handling()
 
 Debugfs
-========
+=======
 The driver creates two debugfs entries per device.
+
 - regcache_dump : dump of register values calculated and saved for all
   frequencies used so far.
 - mr4 : last polled value of MR4 register in the LPDDR2 device. MR4