Revert "optimizations"

This reverts commit 76b827ce8c4698627a019c7e8d9e6bb117b3c83f.
ffast math flags
OMAP4: HSI: Add dynamic OPP change

Added an IOCTL to change HSI FClk to 96MHz or 192MHz.
Decision of when to increase/decrease modem speed is up to Link Layer.

Constraint :
* RX/TX divisors and RX error counters need to be changed after Fclk is changed.
* Read/Write operation must not be pending when OPP change request is issued, otherwise
OPP change is aborted.
* Any Read/Write operation started during HSI OPP change operation will be aborted.

Change-Id: I06e15a205e614506994989ec6a40c0383e32776d
Signed-off-by: Djamil Elaidi <d-elaidi@ti.com>

Conflicts:
	drivers/omap_hsi/hsi-char.c
	drivers/omap_hsi/hsi_driver_if.c