MdeModulePkg/TerminalDxe: Handle more keys with TtyTerm

MdeModulePkg/TerminalDxe: Handle more keys with TtyTerm

The TtyTerm terminal driver is missing support for sequences produced
by the page up, page down, insert, home, and end keys in some terimnal
emulators.  Add them.

Tested under Ubuntu 16.04 using xterm 322-1ubuntu1, GNOME terminal
3.18.3-1ubuntu1, and XFCE terminal 0.6.3-2ubuntu1.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Kyle Roberts <kyroberts@sgi.com>
Signed-off-by: Brian Johnson <bjohnson@sgi.com>
Cc: Feng Tian <feng.tian@intel.com>
Cc: Star Zeng <star.zeng@intel.com>
Reviewed-by: Roy Franz <roy.franz@hpe.com>
Tested-by:   Ryan Harkin <ryan.harkin@linaro.org>
Reviewed-by: Feng Tian <feng.tian@intel.com>