samples: code_relocation_nocopy: fix stm32 flash size info
Fix typos in stm32 flash sizes value introduced by commit 0e1ffc7bebb8
("samples: code_relocation_nocopy: update macro to get flash size").
Fixes: 0e1ffc7bebb80d55ed5cd4b4cc22c221a2c36298
Signed-off-by: Etienne Carriere <etienne.carriere@st.com>