misc: modem_if: regress to old tizen modem driver

misc: modem_if: regress to old tizen modem driver

Tizen modem utility and xmm626x modem uses old style modem I/F. I
brought the driver from linux-3.0 kernel[1] because the driver
should be matched with telephony and modem-util package.

Kamil brought the driver from linux-3.4-exynos, but the driver didn't
match the current telephony daemon and modem util. Data communication
didn't work with the driver. So, I decided to regress to old driver.

Tizen Modem Team doesn't have any plan to update latest version of
modem package. To maintain consistency of the interface, I picked
the driver from linux-3.0 tree.

[1] : https://review.tizen.org/gerrit/gitweb?p=kernel%2Flinux-3.0.git;a=summary

Change-Id: I6123f4dc149dcc38e1ae339f950f94fdc0c033f9
Signed-off-by: Chanho Park <chanho61.park@samsung.com>