add part prefixes

Author: oclyke

SparkFun-IC-Memory.lbr

@@ -7,7 +7,7 @@
 <setting keepoldvectorfont="yes"/>
 <setting verticaltext="up"/>
 </settings>
-<grid distance="0.05" unitdist="inch" unit="inch" style="lines" multiple="1" display="yes" altdistance="0.005" altunitdist="inch" altunit="inch"/>
+<grid distance="0.1" unitdist="inch" unit="inch" style="lines" multiple="1" display="no" altdistance="0.01" altunitdist="inch" altunit="inch"/>
 <layers>
 <layer number="1" name="Top" color="4" fill="1" visible="yes" active="yes"/>
 <layer number="2" name="Route2" color="1" fill="3" visible="yes" active="yes"/>
@@ -964,7 +964,7 @@ Interface consisting of a Serial Data Input (SI), Serial Data Output (SO), Seria
 </device>
 </devices>
 </deviceset>
-<deviceset name="QSPI_PSRAM">
+<deviceset name="QSPI_PSRAM" prefix="U">
 <description>&lt;h3&gt;QSPI PSRAM&lt;/h3&gt;
 &lt;p&gt;Quad-SPI PSRAM chips provide additional memory and are often highly standardized&lt;/p&gt;
 &lt;h4&gt;Example Parts&lt;/h4&gt;

SparkFun-RF.lbr

@@ -13040,7 +13040,7 @@ Why hasn't anyone added the cutout polygons directly to the connector footprint?
 </device>
 </devices>
 </deviceset>
-<deviceset name="ESP32-PICO-D4">
+<deviceset name="ESP32-PICO-D4" prefix="U">
 <description>&lt;h3&gt;Espressif ESP32 Pico D4&lt;/h3&gt;
 &lt;p&gt;
 &lt;ul&gt;