Remove pyocd requirement and update icetea.

Icetea depends on mbed-flasher. mbed-flasher recently released a version
that drops the dependency on pyocd. Icetea released a version that uses
this latest version of mbed-flasher. So now tht pyocd is no longer in
our dependency tree, we can drop it here.

Author: bridadan

requirements.txt

@@ -20,5 +20,4 @@ beautifulsoup4>=4,<=4.6.3
 fuzzywuzzy>=0.11,<=0.17
 pyelftools>=0.24,<=0.25
 git+https://github.com/armmbed/[email protected]
-pyocd>=0.14,<0.15
-icetea>=1.0.2,<1.1
+icetea>=1.2.1,<1.3