Fix ACTION_NFCSHARING_SETTINGS. Add ACTION_NFC_SETTINGS.

ACTION_NFCSHARING_SETTINGS is a new ICS API that doesn't work until now.
It allows application to show UI to turn Android Beam on.

Add ACTION_NFC_SHARING - exposed in MR2.

Remove ANDROID_BEAM_SETTINGS, this was orphanned.

I wish we had renamed ACTION_NFCSHARING_SETTINGS to ACTION_NDEF_PUSH_SETTINGS,
but too late now. It's already released in SDK.

Bug: 5465097
Change-Id: I641b2efa39a3567cbd1c31587f3b67b1b0a0caa0

Signed-off-by: Nick Pelly <npelly@google.com>