test: bluetooth: disable test for STM32F103RB not enough RAM

Disabled bluetooth test for STM32F103RB SOC because there is not
enough RAM space for the test.

Change-Id: I9f097d9201ed659c4970b67f42c570331b92bad8
Signed-off-by: Javier B Perez <javier.b.perez.hernandez@intel.com>