CMSIS-DSP: Some improvements for sign conversion warnings.

Added new tests for function in utils.h
diff --git a/ARM.CMSIS.pdsc b/ARM.CMSIS.pdsc
index ebabbbe..ce57db3 100644
--- a/ARM.CMSIS.pdsc
+++ b/ARM.CMSIS.pdsc
@@ -2233,7 +2233,7 @@
     </component>
 
     <!-- CMSIS-DSP component -->
-    <component Cclass="CMSIS" Cgroup="DSP" Cvariant="Source"  Cversion="1.10.0" isDefaultVariant="true" condition="CMSIS DSP">
+    <component Cclass="CMSIS" Cgroup="DSP" Cvariant="Source"  Cversion="1.11.0" isDefaultVariant="true" condition="CMSIS DSP">
       <description>CMSIS-DSP Library for Cortex-M, SC000, and SC300</description>
       <files>
         <!-- CPU independent -->