amp: add missing whitespace in icicle kit amp machine conf file

A leading white-space between the quotation mark and the package name
is necessary for the append command

Signed-off-by: Valentina Fernandez <valentina.fernandezalanis@microchip.com>

conf/machine/icicle-kit-es-amp.conf

@@ -41,7 +41,7 @@ HSS_PAYLOAD = "amp"
 AMP_DEMO = "freertos"
 #AMP_DEMO = "bm"
 
-IMAGE_INSTALL:append = "polarfire-soc-amp-examples"
+IMAGE_INSTALL:append = " polarfire-soc-amp-examples"
 
 MACHINE_EXTRA_RRECOMMENDS += " kernel-modules"